Pennsylvania's 9/11 memorial is one of the first in the world to use sound as a tribute

Styling a suitable sound for the Flight 93 memorial chimes was a long and arduous process. But Murdoch seems certain it was worth the struggle. While most memorials are unchanged from the day they open up to the public, “through sound and wind activation, it becomes a living memorial, in the sense that it is always changing,” Murdoch says. And while other designs provide one shared experience, the tower will ensure that every visit is unique, even personalized. “There’s an emotional aspect to memorialization where tapping into different sensory experiences can be very valuable,” he says. “It’s offering yet another type of commemoration.”